<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>           
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 头部的警告区域 -->
            <el-alert show-icon
              title="注意：只允许为第三级分类设置相关参数！"
              type="warning" :closable="false">
            </el-alert>
              <!-- 选择商品分类区域区域 -->
              <el-row class="cat_opt">
                  <el-col>
                      <span>选择商品分类：</span>
                      <!-- 选择商品分类的级联选择框 -->
                      <el-cascader
                        expand-trigger="hover"
                        :options="catelist"
                        :props="cateProps"
                        v-model="selectedCateKeys"
                        @change="handleChange" 
                        clearable>
                      </el-cascader>      

                  </el-col>
              </el-row>

              <!-- tab 页签区域 -->
              <el-tabs v-model="activeName" @tab-click="handleTabClick">
                  <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                    @click="addDialogVisible=true">添加参数</el-button>
                    
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染 rag 标签 -->
                                <el-tag v-for="(item, i) in 
                                scope.row.attr_vals" :key="i"
                                closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" 
                                @click="showInput(scope.row)">+ New Tag</el-button>


                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit"
                                 @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>

                </el-tab-pane>
                  <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                    @click="addDialogVisible=true">添加属性</el-button>

                     <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染 rag 标签 -->
                                <el-tag v-for="(item, i) in 
                                scope.row.attr_vals" :key="i"
                                closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" 
                                @click="showInput(scope.row)">+ New Tag</el-button>


                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" 
                                @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete"
                                @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>

                </el-tab-pane>
              </el-tabs>
            
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
          :title="'添加' + titleText"
          :visible.sync="addDialogVisible"
          width="50%"
          @close="addDialogClosed">
          <!-- 添加参数的对话框 -->
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
          </el-form>

          <span slot="footer" class="dialog-footer">
              <el-button @click="addDialogVisible = false">取 消</el-button>
              <el-button type="primary" @click="addParams">确 定</el-button>
          </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog
          :title="'修改' + titleText"
          :visible.sync="editDialogVisible"
          width="50%"
          @close="editDialogClosed">
          <!-- 修改参数的对话框 -->
          <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
          </el-form>

          <span slot="footer" class="dialog-footer">
              <el-button @click="editDialogVisible = false">取 消</el-button>
              <el-button type="primary" @click="editParams">确 定</el-button>
          </span>
        </el-dialog>

    </div>
</template>
<script>
export default {
    data() {
        return {
            //商品分类列表
            catelist: [],
            //级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys: [],
            //被激活的页签的名称
            activeName: 'many',
            //动态参数的数据
            manyTableData: [],
            //静态属性的数据
            onlyTableData: [],
            //控制添加对话框的显示与隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            //添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                    {required: true, message: '请输入参数名称',
                     trigger: 'blur'
                    }
                ]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible: false,
            //修改的表单数据对象
            editForm: {},
            //修改表单的验证规则对象
            editFormRules: {
                attr_name: [
                    {required: true, message: '请输入参数名称',
                     trigger: 'blur'
                    }
                ]
            },

            // // 控制按钮与文本框的切换显示 (默认情况下隐藏文本框)
            // inputVisible: false,
            // //文本框中输入的内容
            // inputValue: ''
        }
    },
    created(){
        this.getCateList()
    },
    methods: {
        //获取所有的商品分类
        async getCateList() {
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败！')
            }

            this.catelist = res.data

            console.log(this.catelist)
        },
        //级联选择框选中项变化，回触发这个函数
        handleChange() {
            this.getParamsData()
        },
        // tab 页签点击事件的处理函数
        handleTabClick() {
            console.log(this.activeName)
            this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData() {
            console.log(this.selectedCateKeys)
            //证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }

            //证明选中的是三级分类
            console.log(this.selectedCateKeys)
            //根据所选分类的Id，和当前所处的面板，获取对应的参数
            const { data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName}
                })

            if(res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败！')
            }

            console.log(res.data)
            //在赋值前将每一项进行for循环
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ?
                item.attr_vals.split(' ') : []
                //(添加布尔值) 控制文本框的显示与隐藏
                item.inputVisible = false
                //控制文本框中输入的值
                item.inputValue = ''
            })

            console.log(res.data)

            if(this.activeName === 'many') {
                this.manyTableData = res.data
            }else {
                this.onlyTableData = res.data
            }

        },
        //监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return 
                const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })

                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！')
                }

                this.$message.success('添加参数成功！')
                //关闭对话框
                this.addDialogVisible = false
                //刷新数据列表
                this.getParamsData()
            })
        },
        //点击按钮展示修改的对话框
        async showEditDialog(attr_id) {
            //发起请求与处理,查询当前参数的信息
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel: this.activeName}
            })

            if(res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        //重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/
                ${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel:this.activeName
                })

                if(res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }

                this.$message.success('修改参数成功！')
                //刷新数据列表
                this.getParamsData()
                //隐藏对话框
                this.editDialogVisible = false
                
            })
        },
        //根据Id删除对应的参数项
        async removeParams(attr_id) {
            //询问用户是否删除数据
            const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
        }
        ).catch(err => err)

        //如果用户确认删除，则返回值为字符串 confirm 
        //如果用户取消了删除，则返回值为字符串 cancel
        // console.log(confirmResult)

        if(confirmResult !== 'confirm') {
            return this.$message.info('已取消删除')
        }
        // console.log('确认了删除！')

        //删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}
        /attributes/${attr_id}`)

        if(res.meta.status !== 200) {
            return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功!')
        //重新获取数据列表
        this.getParamsData()

        },
        //文本框失去焦点或按下 Enter 都会触发
        async handleInputConfirm(row) {
            // console.log('ok')
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return 
            }
            //如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false

            //调用下面的函数
            this.saveAttrVals(row)

            //需要发起请求，保存这次操作
            // const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
            //     attr_name: row.attr_name,
            //     attr_sel: row.attr_sel,
            //     attr_vals: row.attr_vals.join(' ')
            // })

            // if(res.meta.status !== 200) {
            //     return this.$message.error('修改参数项失败！')
            // }

            // this.$message.success('修改参数项成功！')
            
        },
        //将对 attr_vals 的操作，保存到数据库
        async saveAttrVals(row) {
            //需要发起请求，保存这次操作
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })

            if(res.meta.status !== 200) {
                return this.$message.error('修改参数项失败！')
            }

            this.$message.success('修改参数项成功！')
        },
        //点击按钮，展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，
            // 才会指定回调函数中的代码
            this.$nextTick(_ => {
              this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        //删除对应的参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }

    },

    computed: {
        //如果按钮需要被禁用，则返回 true.否则返回 false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        //当前选中的三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
    
}
</script>
<style lang="less" scoped>
    .cat_opt {
        margin: 15px 0;
    }

    .el-tag {
        margin: 10px;
    }

    .input-new-tag {
        width: 120px;
    }
</style>